Professor Layton,
Hey. Just wanted to say first off thanks for taking a look at this piece.
To answer your question, I'm going to be fairly honest and say that this deck depends heavily on Shaymin-EX for the draw support. It's too strong not to play.
You could play Octillery and Unown in lieu of Shaymin-EX if the cost is too much. However, the deck would not be the same. Octillery can get you some of the cards you need via its Abyssal Hand, but you would not be able to discard it for Despair Ray as you need to continuously draw cards with this deck. Unown is kind of cute as it can be a Bench Warmer to power up Despair Ray or it can be used to help you draw more cards via Farewell Letter. However, I would suggest finding a way to get those Shaymin-EX as they are a very powerful staple in these formats!
I hope I could be of assistance.
-Brandon